Gravitts are a hermit crab-like species native to SR388 in Metroid II: Return of Samus and its remake, Metroid: Samus Returns. In Metroid II, This creature hides in the floor, only coming out to attack when Samus Aran comes close. When hidden, only the spike on top can be seen, which cannot be shot with a narrow-beamed weapon. Samus must jump over and shoot down at them while they are hidden. These creatures are notorious for hiding under destructible Sand blocks, so caution should be exercised when traveling on the bottom of a sandy area.
In Metroid: Samus Returns, these creatures are much more aggressive and no longer hide in the floor. They also no longer hide in Sand blocks, as the blocks are not present in the remake. They now sometimes try and stab Samus using their claw-like feet. This attack is counterable, and successfully countering it causes them to fall upside-down, making them vulnerable to beam weapons, although this does not work with the later Black Gravitts. Samus can only defeat this variant with the Beam Burst or Power Bombs.
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- Issue 31 of Nintendo Power erroneously refers to Rock Icicles as a Gravitt on page 56.
- Gravitts bear similarities to Ramulkens, another creature found on SR388.
- It is unknown if the Gravitt species was infected by the X Parasites, as Samus never encountered any Gravitt-X in Fusion.
- The sound Gravitts make when emerging from the ground in Samus Returns is strikingly similar to the death scream of a Kyratian in Metroid: Other M.